Show case properties in the "Case History" table of the Case Export page by default

Previously, you had to check the "show advanced and deleted properties" box to see all properties in the case history table. Now, all of those properties will be shown regardless of whether the box is checked or not. (The "Cases" table is unaffected).

Addresses this ticket:
http://manage.dimagi.com/default.asp?123010#695770
that's true - though i still think there are a few reasons to move it:

1. that code is already full of a lot of hard-coded stuff like this, so it's nice that the hard coding lives in a single place.
2. i'm not sure you would necessarily set it for all of them (for example i can't imagine people want to see `sync_log_id`)
3. it would only apply to case exports (in the current proposed change, if a form export happened to have an "actions" property i think it would also get shown here)